Ultrasonic borehole wall imaging method applied to cylindrical ultrasonic array

Abstract

The invention relates to an ultrasonic borehole wall imaging method applied to a cylindrical ultrasonic array. The method comprises: step 1) driving each transducer array element in the cylindrical ultrasonic array, sequentially transmitting ultrasonic signals separately, all transducer array elements receiving echo signals corresponding to each transmitted signal at the same time; step 2) using the echo signals obtained in step 1), performing point-by-point focusing imaging processing on each imaging point according to a synthetic aperture focusing algorithm, to obtain echo amplitude data corresponding to each imaging point; and step 3) splicing the echo amplitude data corresponding to each imaging point, to obtain an amplitude imaging image in an entire imaging plane. The ultrasonic wellbore wall imaging method is applied in ultrasonic borehole wall detection, and would greatly reduce the number of independent channels of the cylindrical array ultrasonic borehole wall imaging system,reduce hardware cost of a system, and the method can improve resolution ratio of borehole wall imaging detection under the condition that the frequency of a downhole transducer is low.

Description

technical field [0001] The invention relates to the technical field of ultrasonic wellbore imaging, in particular to an ultrasonic wellbore imaging method applied to a cylindrical ultrasonic array. Background technique [0002] Ultrasonic borehole wall imaging detection technology uses the amplitude information extracted from the reflected echo of the borehole wall or casing wall to clearly and intuitively display the condition of the borehole wall in the form of an echo amplitude map. Compared with the traditional ultrasonic borehole wall imaging detection technology, the cylindrical array ultrasonic borehole wall imaging detection technology has the advantages of avoiding probe rotation and adjustable focus point, and has received extensive attention in recent years. The existing cylindrical array ultrasonic borehole wall imaging adopts phased array imaging technology. By controlling the transmission and reception delays of each independent channel, the emission beam of th...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the technical problems of complex board wiring and low detection accuracy in the existing phased array imaging technology. The present invention provides an ultrasonic wellbore imaging method applied to a cylindrical ultrasonic array. The method Applied to ultrasonic wellbore imaging detection, it will greatly reduce the number of independent channels of the cylindrical array ultrasonic wellbore imaging system, reduce the hardware cost of the system, and avoid the circuit board of the ultrasonic wellbore imaging system due to the limited space in the underground Complex wiring and system instability

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